bikeskint Posted August 10 Report Share Posted August 10 Hi just picked up a 1978 tr77 starts lovely and idles nicely BUT after a few minutes it will pick up the revs to almost maximum without any input without sounding dense where do i start? Quote Link to comment Share on other sites More sharing options...
lemur Posted Sunday at 12:34 PM Report Share Posted Sunday at 12:34 PM (edited) Uncontrolled acceleration can be caused from intake vacuum leak. ... that is where you have a very small air leak type hole somewhere between the carb and cranckcase. Edited Sunday at 12:36 PM by lemur 2 Quote Link to comment Share on other sites More sharing options...
kurtas Posted Sunday at 10:56 PM Report Share Posted Sunday at 10:56 PM What happens if you give the throttle a big blip when it starts revving up? Could also be starved of fuel if there is not an air leak as Lemur has suggested. 1 Quote Link to comment Share on other sites More sharing options...
bikeskint Posted 1 hour ago Author Report Share Posted 1 hour ago Ok just an update.. the carburettor slide was gummed up And by the paperwork supplied by the previous owner they had paid a reputable bike garage to strip And clean the carburettor And service the bike seems the garage took the money And didn't do anything 🤦♂️ Quote Link to comment Share on other sites More sharing options...
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